shibipvs

Clutch/RPM Issue

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Hi,

I own a Hyundai i20 sportz bought about a year ago and I am experiencing a wierd issue with the car.

Whenever I am depressing the clutch to change gears mainly from 1st to 2nd vice versa or from 1st to reverse vise versa(main problem here) the RPM shoots up to nearly 1500 to 2000 sometimes.

Now bear in mind that I am not depressing the throttle its just the clutch.

As per my understanding when clutch is depressed rpm should not go up it should only go up when throttle is depressed.

Please help me in understanding as to why this would happen when I am not depressing the throttle in anyways???

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I had gone to Hyundai dealer for 3rd free service and mentioned this issue, mechanic stated he has diagnosed the issue with the computer however I dont see an improvement, I am planning to escalate this matter with Hyundai Motor India ltd.

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That's because he probably didn't read the tranny harness signals to the ECU....if there were any signals.  On some cars you have to diagnose the tranny separatel.  That means putting it on the lift while monitoring the signals both (input and output) at the tranny and the ECU.

Diagnosing the on-board electronic system takes patience and skill.  There is a lot of interaction designed to keep emissions to a minimum.  For instance when you let up on the gas, the ECU controls the rpm's to burn any residual fuel so you'll notice the rpm drops a bit slower.  There  are other conditions both mechanical and electronic too numerous to mention and if the mechanic can't solve it the go to the service office and have them call the regional engineer.  He covers a pretty large area and it is his job to stay current on the factory service bulletins and resolve the issue with your car.

Please keep in mind that new cars with new technologies require an automotive engineer with mechanical and electronic skill sets. Quite an upgrade from 20 years ago.  ....and they make good money.   Many small shops can't afford a professional but most know a specialist they can call...ie; the regional engineer.

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I should add a bit more.  The only way that an engine can accelerate is if it has more air.  Air is controlled by an air solenoid and they come in many shapes and sizes.  There is also a plethora of vacuum tubes that can leak as well as gaskets in the plenum. 

You can also run a test with and without the a/c running as it also affects the IAC.

Bottom line is to go to the dealer and get him to make that phone call.

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@shibipvs

 

I have seen this issue mostly in Automatics , i have been reserching / gettig to know automatics for quite some time now.

 

Though some might say its advantageous for you,You don't loose torque while gear shifts. Say You have revved your car to 2000 rpm and you change gears so that you can achieve higher speeds. Howver, the engine looses rpm during change (say to 1500 rpm) and hence, you will have to again rev it all the way up, meaning, you will have to wait for acceleration/power in the new gear.

 

Check the IIRC and IMO for your variant all cars are mapped to work in a way , may be your SPORTS version is tuned for SPORTS like performance.

 

Most ECU / ECM takes care of this , also this is a known side-effect of some cars with drive by wire accelerators

 

In automatics A/T, the tacho would rise without change in speedo reading, thus i said it normal in AT 

 

Just a final question is the engine HOT ( after a long drive) when this happens or this is a regular feature , another common indicator when it happens.

 

 

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@librankur
Yes the engine becomes very hot after a long drive.

 

nnaaaa

 

all engines get hot after a long ride , what i meant was do you face the problem only when the engine is hot or even with the engine is at normal temperature  

 

because this is a known problem after the engines gets hot and upuntill now in all cases , its nothing serious.

 

anyways what did your service engineers say?

 

i essentially think , what i think as i wrote earlier its just your  SPORTS variant tuning , may be this is the way these variants are tuned , to give you a peppy feel with all the roaring

 

 

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@librankur

Well I am taking the car to the dealership and the service engineer has mentioned he will check the car with the computer to change some settings.

@librankur: Anything particular he has to look out for?

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dear shibi,

 

Make sure you give them this problem in written form and taking a copy thereof , this may help you on a later stage , clearly mention that you are coming again and again for the same problem and this cannot go on endlessly , either they rectify the problem or give a proper explanation for this engine behaviour, my idea is that you should be satisfied after what explanation they give.(in written)

 

I am specifically asking to give this problem in writing coz after the initial warranty on the car they would care the least what happen to your car and shrug their responsibility thereof , so by doing this you will have some proof in your defence if such time comes and say it been happing all along and these guys are unable to fix it.

 

What all i want them to check is already mentioned in my last post .

 

By law a manufacturer cannot sell you a defective piece of machinery and shrug his responsibility thereof.

 

 

remember the key word - WRITTEN

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@Akholic : I've been to the Bhosari workshop with this issue earlier and that's their main workshop for Sanjay Hyundai

@librankur

Thanks for the advise, I will give them this issue in writing and take back a acknowledgement copy with me.

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@librankur

This might sound funny to you as nothing happened as planned earlier

A mechanic drove my car while I was sitting along side him, he mentioned the RPM going up while changing gears is normal operation of most cars especially Hyundai cars.

The RPM goes up couple of hundred RPMs so that the car does not stall.

RPM stays up for few seconds and comes down while changing gears is normal.

When I heard this from an engineer I got convinced as came back home.

@librankur : Have you observed this thing in your cars, especially in the lower gears???

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Alls well that end well.

 

... my idea is that you should be satisfied after what explanation they give ...

 

[/quote']

 

 

... Though some might say its advantageous for you, You don't loose torque while gear shifts. Say You have revved your car to 2000 rpm and you change gears so that you can achieve higher speeds. Howver, the engine looses rpm during change (say to 1500 rpm) and hence, you will have to again rev it all the way up, meaning, you will have to wait for acceleration/power in the new gear ...

 

may be your SPORTS version is tuned for SPORTS like performance.

 

[/quote']

 

As it turns out,  the Engineer / Mechanic told you nothing that you did not know, though its important that you are happy hearing the same from him, now enjoy your ride and forget about the problem.

 personally even if it happens it does not bother me , i like the engine growling anyways.

move on

;)

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